Base size, as a CSS length. Everything else scales from it.
Rules and borders.
OptionalcustomCSS font stack. Give a real fallback chain; a PDF converter needs it.
Lines printed in the footer, e.g. payment terms or company details.
Body text colour.
Extra lines in the supplier block: phone, email, web, registration.
OptionallogoSecondary text: labels, references, the footer.
Page margin for @page, e.g. 16mm 14mm.
Page size for @page, e.g. A4 or Letter.
Background of the markings panel.
Show the "rendered from reported data" note. Defaults to true.
Layout template — a structural choice above colours and fonts.
standard (the default) is the roomy layout. compact tightens the
spacing and type scale to fit more on a page, for a dense invoice or a
short receipt. Both honour every other theme field.
Tint alternate table rows. Off by default; it prints heavier.
Accent for headings, rules and the total.